/Engine/Source/Runtime/Engine/Classes/EdGraph/EdGraphSchema.h
Determine if the supplied pin default values would be valid.
An empty string if the new value is legal, otherwise a message describing why it is invalid.
virtual [FString](API\Runtime\Core\Containers\FString) IsPinDefaultValid ( const [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * Pin, const [FString](API\Runtime\Core\Containers\FString) & NewDefaultValue, [TObjectPtr](API\Runtime\Core\Delegates\TObjectPtr)< [UObject](API\Runtime\CoreUObject\UObject\UObject) > NewDefaultObject, const [FText](API\Runtime\Core\Internationalization\FText) & InNewDefaultText ) const